#include <bits/stdc++.h>
using namespace std;
#ifdef tabr
#include "library/debug.cpp"
#else
#define debug(...)
#endif
void build(vector<vector<int>>);
struct dsu {
vector<int> p;
vector<int> sz;
int n;
dsu(int _n) : n(_n) {
p.resize(n);
iota(p.begin(), p.end(), 0);
sz.assign(n, 1);
}
inline int get(int x) {
if (p[x] == x) {
return x;
} else {
return p[x] = get(p[x]);
}
}
inline bool unite(int x, int y) {
x = get(x);
y = get(y);
if (x == y) {
return false;
}
if (sz[x] > sz[y]) {
swap(x, y);
}
p[x] = y;
sz[y] += sz[x];
return true;
}
inline bool same(int x, int y) {
return (get(x) == get(y));
}
};
int construct(vector<vector<int>> p) {
int n = (int) p.size();
dsu uf1(n);
for (int i = 0; i < n; i++) {
for (int j = i + 1; j < n; j++) {
if (p[i][j] == 1) {
uf1.unite(i, j);
}
}
}
vector<vector<int>> res(n, vector<int>(n));
vector<vector<int>> c(n);
for (int i = 0; i < n; i++) {
c[uf1.get(i)].emplace_back(i);
}
for (int i = 0; i < n; i++) {
for (int j = 1; j < (int) c[i].size(); j++) {
res[c[i][0]][c[i][j]] = res[c[i][j]][c[i][0]] = 1;
}
}
for (int i = 0; i < n; i++) {
for (int j = i + 1; j < n; j++) {
if (p[i][j] != p[uf1.get(i)][uf1.get(j)]) {
return 0;
}
}
}
dsu uf2(n);
for (int i = 0; i < n; i++) {
for (int j = i + 1; j < n; j++) {
if (uf1.get(i) == i && uf1.get(j) == j && p[i][j] > 2) {
uf2.unite(i, j);
}
}
}
c = vector<vector<int>>(n);
for (int i = 0; i < n; i++) {
if (uf1.get(i) == i) {
c[uf2.get(i)].emplace_back(i);
}
}
for (int i = 0; i < n; i++) {
int sz = (int) c[i].size();
if (sz == 0 || sz == 1) {
continue;
}
if (sz == 2) {
return 0;
}
for (int j = 0; j < sz; j++) {
res[c[i][j]][c[i][(j + 1) % sz]] = res[c[i][(j + 1) % sz]][c[i][j]] = 1;
}
int z = p[c[i][0]][c[i][1]];
if (z == 3) {
if (sz == 3) {
return 0;
}
res[c[i][0]][c[i][2]] = res[c[i][2]][c[i][0]] = 1;
}
for (int x = 0; x < sz; x++) {
for (int y = x + 1; y < sz; y++) {
if (p[c[i][x]][c[i][y]] != k) {
return 0;
}
}
}
}
build(res);
return 1;
}
Compilation message
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:110:44: error: 'k' was not declared in this scope
110 | if (p[c[i][x]][c[i][y]] != k) {
| ^
